Attachment for steam-feed-cylinder valves.



No. 713,350. V Patentbd Nov. I8, 1902."-

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ATTACHMENT FOR STEAM FEED CYLINDER VALVES.

(Application filed Apr. 3, 1902.)

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No. "3,850. 'PatentedNov; 811902;

W. B. BUBR UWS.

ATTACHMENT ron STEAM FEED rvmimzn VALVES.

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MITE Frames PATENT OFFICE.

HALF TO UNION IRON WORKS, PORATION OF MINNESOTA.

OF MINNEAPOLIS, MINNESOTA, A COR- ATTACHMENT FOR STEAM-FEED-CYLINDERVALVES.

SPECIFICATION forming part of Letters Patent No. 713,850, dated November18, 1902. Application filed April 3, 1902. Serial No. 101,148. (Nomodel.)

To all whom it 77tCty concern:

Be it known that I,WILLIAM B. BURRows, ofMinneapolis, Hennepin county,Minnesota, have invented certain new and useful Improvements inAttachments for Steam-Feed- Cylinder Valves, of which the following is aspecification.

The valves employed in connection with steam-feed cylinders, generallyknown as sawyers valves, must be large enough to allow the formation ofsteam-passages of the proper size therein, and said valves must movewith sufficient freedom to enable the sawyer to have quick and accuratecontrol of the cylinder-piston. Ordinarily there is considerable leakageand waste of steam around such valves, owing to the fact that it ispractically impossible to provide steam tight joints between the valvesand their casings and at the same time render the valves easily operableby the movement of the sawyers lever.

The object, therefore, of my invention is to prevent any unnecessarywaste of steam and at the same time render the sawyers lever even easierof operation than heretofore, while giving the sawyer absolute and quickcontrol over the cylinder-feed valves.

The invention consists generally in provid- 0 ing motors having suitableconnections with the sawyers valves and operable connections providedbetween said motors and the sawyers lever.

Further, the convention consists in various constructions andcombinations, all as hereinafter described, and particularly pointed outin the claims.

In the accompanying drawings, forming part of this specification, Figure1 is a side elevation of a steam-feed cylinder, the sawyers valvesconnected therewith, and my invention connected to said valves and tothe sawyers lever. Fig. 2 is a longitudinal section of one engine foroperating the sawyers valves. Fig. 3 is a similar view of the otherengine. Fig. 4. is a plan viewshowing the connection between the sawyersvalves and the engine for operating the same. Fig. 5 is I an end view ofthe valve-operating engines.

In the drawings, 2 represents a steam-feed cylinder supported on timbers3, 4 a portion of the sawmill-carriage carrying the bracket 5, to whichthe piston-rod 6 is connected in the usual way. 7 represents the valvescontrolling the admission of steam to the ends of the cylinder, thesevalves being under the control of the sawyer and generally known as thesawyers valves. Their casings are connected by the pipes 8 with the endsof the cylinder, and the reciprocation of the valves alternately admitssteam to one side of the piston and exhausts the opposite side. Suitablelive-steam and exhaust pipes lead into these casings, as shown inFig. 1. The pistons of the sawyers valves are provided with the usualrods 9 and 9.

Between the sawyers valves upon opposite sides of the connecting-rod Iprovide cylinders 10 and 10, secured to a casting 11, that is bolted tothe under side of a cross-timber 7o 12. These cylinders are providedwith pistons 13 and 13, having rods 14, that are provided with couplings15, connected to links 16, that are pivoted, respectively, neartheopposite ends of a bar 17, which at a point near the middle thereof ispivotally connected by suitable couplings 18 with the abutting ends ofthe connecting-rods 9 and 9', the usual single rod being formed in twoparts to permit this form of connection. Each piston is provided with arod 14' on the opposite side of the piston from the rod 14 and slidablein the opposite end of the cylinder. These rods 14 cause the same areato be exposed to the steam on one side of the piston as on the other andpermit balancing of the same. The cylinders 10 and 10 are pro vided withports 19 and 19" and 20 and 20', communicating with the ends of thecylinders, respectively, and with valve-casings 21, go that are providedwith suitable steam inlet and exhaust openings and with slidingpiston-valves 22 and 22, which are adapted to alternately open and closethe communicating passages between said ports and the steam 5 inlet andexhaust openings. The piston-valves have longitudinal openings to permitthe communication of the ports 19 and 20 with the exhaust.

Any suitable connection may be provided between the sawyers lever 23 andthe pistonvalves; but I prefer to provide a rack-shaft 24, supportedupon suitable timbers 25 and provided with arms 26, that are pivotallyconnected with the stems 27 of the valves 22 and 22'. A crank 28 issecured on said rock-shaft and is connected with the lower end of thesawyers lever by a rod 29. Movement of the sawyers lever will rock theshaft 24, oscillate the arms 26, and cause reciprocation of thepiston-valves, Assuming that the pistonvalves are in their normalposition, as shown in Figs. 2 and 3, if the sawyers lever be moved toslide said piston-valves toward the left the valve 22 after passing theport 19 will open the right end of the cylinder 10 to the exhaust andthe port 20 to the live steam. The piston 13 will thereupon be set inmotion toward the right-hand end of its cylinder, oscillating the bar 17and moving the sawyers valves. The piston-valves having correspondingconnections to the same rock-shaft will move in unison, and therefore asthe valve 22 moves toward the left hand to open the port 19 to theexhaust the valve 22 will be moved a corresponding distance; but theport 20 being already open to the exhaust and the port 19' being open tothe live steam no change will take place as regards the piston 13, whichwill remain stationary in the righthand end of its cylinder. If desired,the valve 22 may be moved along opposite the ports 19 and 20, so thatboth ports will be partially open to the steam, which, entering thecylinder 10 upon each side of the piston 13, will balance said pistonwherever it may happen to be in its cylinder at that time. The movementof the valve 22 to produce this balancing of the piston 13 being towardthe left, a corresponding movement will be imparted to the valve 22, butwithout any change as regards the opening or closing of the ports 19 and20 to the live steam and exhaust. Consequently the piston 13' willremain stationary during such balancing of the piston 13.

We will now suppose that, the piston-valves beingin the position shownin Figs. 2 and 3,the sawyer throws his lever in the otherdirection andmoves the piston-valves toward the right. During such movement of thevalve 22 the ports 19 and 20 will be open, respectively, to

. the steam and the exhaust and will continue to be so throughout themovement of the valve 22 toward the right. In moving the valve 22,however, toward the right the port 20 will shortly be opened to the livesteam and the port 19 to the exhaust, and as soon as this occurs thepiston 13 will begin to move toward theleft-hand end of its cylinder,while the piston 13 will remain stationary in the corresponding end ofits cylinder. When the piston 13 is being operated, the piston 13 willbe held stationary by the pressure of steam behind it, and the bar 17Will swing on the pivot as a center that is at the end of said baradjacent to the stationary piston, which will act as a fulcrum for thebar or lever, and when the piston 13 is being moved said bar will swingon the pivot at its opposite end, while the stationary piston 13 willserve as a fulcrum therefor. During such movement of said bar one endwill be stationary and its opposite end and middle portion reciprocatedto move the connecting-rods lengthwise and actuate the sawyers valves.

In moving the valve 22' toward the right a point will be reached wheresteam can be admitted to both sides of the piston 13 to balance it atany point in its cylinder, as described, with reference to the piston13.

From the foregoing description it will be understood that movement ofthe sawyers lever in one direction willcause one of the pistons to beactuated and movement of the leverinthe other direction will produce acorresponding movement of the other piston, the particular piston movedas the lever is swung forward or back depending upon the manner ofmaking the connections. The piston-valves have small area as comparedwith that of the sawyers valves, and hence can be made to operate veryeasily, though forming close joints within their casings and permittinglittle or no leakage of steam.

The use of the two reciprocating engines, one upon each side of theconnecting-rod, enables me by moving their pistons from one end of theircylinders to the other to determine the position of the sawyers valveswith respect to the feed-openings, and by the employment of theseengines with the operating mechanism described I am able to have perfectcontrol over the movement of the sawyers valves and at the same time toconstruct them with such close-fitting joints that leakage and waste ofsteam is practically eliminated. I have shown my valve-operatingmechanism employed in connection with two sawyers valves, one at eachend of the steamfeed cylinder; but it will be understood that thismechanism is also applicable for operating one valve, if desired.

I do not wish to confine myself to the means shown for connecting thereciprocating engines to the connecting-rods nor to the particnlar meansemployed for operating the sliding piston-valves from the sawyers lever,as the same is capable of various modifications without departing fromthe spirit of my invention-- 1 claim as my invention-- 1. Thecombination, with a steam-feed cylinder and its piston, of feed-valvesfor said cylinder, connecting-rods for said valves, a bar interposedbetween the abutting ends of said rods and pivoted centrally thereto,fluidpressure motors provided near said rods and having their pistonspivotally connected with the ends of said bar, respectively, suitablevalves for said motors, and operative connections provided between saidvalves and said sawyers lever.

2. The combination, with a steam-feed cylinder and its piston, of thecylinder feedvalves, connecting-rods for said valves, a bar pivoted at apoint intermediate to its ends to the abutting ends of said rods,reciprocating engines provided upon opposite sides of said rods andhaving their pistons pivotally connected with the ends respectively ofsaid bar, sliding piston-valves for said engines having ports adapted toadmit steam to one side of one piston and to the opposite side of theother, according to the direction said valves are moved, a rock-shafthaving arms pivotally connected with the stems of said valves, a crankprovided on said rock-shaft, a sawyers lever, and suitable connectionsprovided between said crank and said lever.

3. The combination, of the steam-feed or sawyers valves and theirconnecting-rods, with a bar centrally pivoted to the adjacent ends ofsaid rods, cylinders provided upon opposite sides of said rods, pistons13 and 13 therein having their rods pivotally connected with the endsrespectively of said bar, valvecasings provided on said cylinders havingsuitable steam inlet and exhaust openings, ports 19 and 19 and 20 and 20leading from said valve-casings respectively to said cylinders near theends thereof, sliding pistonvalves 22 and 22 provided in said casingsand adapted to admit steam simultaneously to both sides of either pistonto balance the same in their cylinders or to admit steam to one side ofone piston and to the opposite side of the other, a saWyers lever, andsuitable connections provided between said lever and said piston-valves.

4. The combination, of a steam-feed cylinder and its piston, with thecylinder feedvalves having connecting-rods 9 and 9, a bar between theadjacent endsof said rods and pivotally connected therewith,engine-cylinders provided upon opposite sides of said connecting-rods,pistons therein having their rods pivotally connected respectively withthe ends of said bar, one piston beingin one end of its engine-cylinderwhen the other piston is in the opposite end of the cylinder, slidingpiston-valves provided on said engine-cylinders, having steam inlet andexhaust openings, suitable ports leading from the casings of said valvesto the ends respectively of said engine-cylinders, said piston-valvesbeing adapted to admit steam to one end of either engine-cylinder tomove the piston therein and swing said bar and simultaneously to admitsteam to the opposite end of the other cylinderand hold its pistonstationary, a rockshaft, arms provided thereon having pivotalconnections with the stems of said pistonvalves, a crank provided onsaid rock-shaft, a sawyers lever and a rod pivotally connecting saidcrank with said lever.

5. The combination, with a steam-feed cylinder and its piston, of acylinder feed-valve, a connecting-rod therefor, a bar pivoted at a pointintermediate to its ends on said rod, reciprocating engines providedupon opposite sides of said rod and having their pistons pivotallyconnected with the ends respectively of said bar, sliding piston-valvesfor said engines and having ports adapted to admit steam to one side ofone piston and to the opposite side of the other according to thedirection in which said valves are moved, one piston and the adjacentend of said bar being held stationary by the pressure of the steambehind the piston while the other piston and the other end of said barare moved to actuate said feed-valve, a sawyers lever, and suitableoperative connections provided between said lever and saidpiston-valves.

In witness whereof I have hereunto set my hand this 26th day of March,1902,

WILLIAM B. BURROVS.

In presence of RICHARD PAUL, M. O. NooNAN.

